package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {
    @Autowired
    ShoppingCartMapper shoppingCartMapper;
    @Autowired
    DishMapper dishMapper;
    @Autowired
    SetmealMapper setmealMapper;

    @Transactional
    @Override
    public void addShopping(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        //只能查询自己的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());
        if (shoppingCart.getUserId() == null) {
            throw new IllegalStateException("User ID cannot be null");
        }
//        Long setmealId = shoppingCartDTO.getSetmealId();
        //判断该商品是否在购物车内
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);
        if(shoppingCartList!=null&&shoppingCartList.size()==1){
            //如果已经存在，就更新数量，数量加1
            shoppingCart = shoppingCartList.get(0);
            shoppingCart.setNumber(shoppingCart.getNumber() + 1);
            shoppingCartMapper.updateNumberById(shoppingCart);

        }else{
                //如果不存在，插入数据，数量就是1
                  Long dishId = shoppingCartDTO.getDishId();
                //判断当前添加到购物车的是菜品还是套餐
                if (dishId != null) {
                    //添加到购物车的是菜品
                    Dish dish = dishMapper.findById(dishId);
                    shoppingCart.setName(dish.getName());
                    shoppingCart.setImage(dish.getImage());
                    shoppingCart.setAmount(dish.getPrice());
                } else {
                    //添加到购物车的是套餐
                    Setmeal setmeal = setmealMapper.findById(shoppingCartDTO.getSetmealId());
                    shoppingCart.setName(setmeal.getName());
                    shoppingCart.setImage(setmeal.getImage());
                    shoppingCart.setAmount(setmeal.getPrice());
                }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            if (shoppingCartMapper==null)
            {
                log.info("mapper");
            }
            //shoppingcart属性被赋值，将其添加到表上
            try {
                shoppingCartMapper.addShopping(shoppingCart);
            } catch (Exception e) {
                e.printStackTrace();
                throw new RuntimeException("添加购物车失败", e);
            }

        }
    }

    @Override
    public List<ShoppingCart> showShoppingCart() {
        return shoppingCartMapper.list(ShoppingCart.
                builder().
                userId(BaseContext.getCurrentId()).
                build());
    }

    @Override
    public void cleanShoppingCart() {
        shoppingCartMapper.deleteByUserId(BaseContext.getCurrentId());
    }

    @Override
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        //设置查询条件，查询当前登录用户的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        if(list != null && list.size() > 0){
            shoppingCart = list.get(0);

            Integer number = shoppingCart.getNumber();
            if(number == 1){
                //当前商品在购物车中的份数为1，直接删除当前记录
                shoppingCartMapper.deleteById(shoppingCart.getId());
            }else {
                //当前商品在购物车中的份数不为1，修改份数即可
                shoppingCart.setNumber(shoppingCart.getNumber() - 1);
                shoppingCartMapper.updateNumberById(shoppingCart);
            }
        }
    }
}
